INTENT/SCOPE: mode reference implementation (handoff semantics for P2, email master/slave roles, callback stub, reuse surface)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 5787@bnt-lap001
Assistant-Session: 5db26b82-138b-40cc-9856-4d5eb0f752fd

SCOPE.md

@@ -41,12 +41,22 @@ delivery stays external.
   tested against a real Postfix by `experiments/postfix-probe/` and
   `tests/test_postfix_profile.py` (needs Docker). Exim: notes only
   (`integrations/exim/NOTES.md`).
+- **Mode reference implementation** (new; INTENT.md, *Mode reference
+  implementation*). A language-neutral mode contract (handoffs, statuses,
+  timeouts, master/slave roles, outside-master commands) with JSON schemas
+  and fixtures. The email side implements both roles: master per resource
+  type, or slave to an outside master that issues case ids. Test stubs: a
+  scripted callback mode and a fake outside master. Email is the only real
+  channel.
 - **Live test environment.** `deploy/railiance/`: the MX for
   `mas.coulomb.social`, with replies through Scaleway TEM capped at 300.
   It is temporary; MAS-WP-0007 retires it.
 
 ## Out of Scope
 
+- Real non-email modes (telephony, chat, SMS, video), connectors to real
+  CMS or ticketing products, and the multimodal framework itself. Other
+  modes exist here only as contract-speaking test stubs.
 - Implementations in other languages (TypeScript, Go), until a second
   consumer exists. That is also the gate for declaring v0.2 final
   (MAS-WP-0009).
@@ -72,6 +82,9 @@ delivery stays external.
   MAS-WP-0009 (declare v0.2 final; waits for a second implementation or
   deployment).
 - v0.2 stays a draft (founder, 2026-10-19).
+- P2 is decided: `!MODE` requests a handoff, defined by the mode contract
+  (founder, 2026-10-19). The mode contract and stubs are not started yet;
+  they need a workplan.
 - The live `mas-mx` pod runs an image built before the profile refactor.
 - Tests: `.venv/bin/pytest` runs 199 tests, offline apart from loopback
   fixtures and the Docker probe.